[oe] openjdk-7 and gcc v5

[Bruce, Henry]

Many thanks to contributors who fixed openjdk build issues introduced by gcc v5 and for maintainers for pushing the updates.
However one problem remains: openjdk build fails in openjdk/jdk/make/java/nio due to -static compiler flag being used in conjunction with -pthread giving error
/usr/bin/ld: cannot find -lpthread
/usr/bin/ld: cannot find -lc

I fixed this by removing -static flag from Makefile. Not sure of this was the right thing to do (so I didn't submit patch) but it worked for me. 
I added the following to the an openjdk bbappend and it fixed the build and resulting jre is running OK.

do_configure_append() {
	gcc -v 2>&1 | grep 5\..
	if [ "$?" == "0" ]; then
		sed -i s/-static// ${B}/openjdk/jdk/make/java/nio/Makefile
	fi
}

Regards,

Henry Bruce